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The Heater does capture engine heat. I went this route because when I calculated footprint and cost for a Webasto, Calorifier, heat exchangers, Solenoid valves it didn't make sense. I'm probably going over the top with this system...but if you want to be able to preheat engine while...

That is the other advantage to ITR Heater....it is instant hot water heat. No need for a calorifier/hot water heater. I'm a sailor and so had a similar setup in my boat.

I'm using this Oasis Zephyr – Itrheat with dedicated engine preheat loop. Great footprint (mounting outside below habitat).